thats a good news for me if Crell CA20 is a clone of Crest Audio CA18
i'm planning to buy 2 Crell CA20 but i can get used one Crest Audio CA18 amp(120 Volt version needs step down transformer) for the same price of a one brand new Crell CA20.
does Crell CA20 amp can you drive it in 2 ohm load? according to amp specification you can drive it to 4 ohm load & didn't says about 2 ohm loading.

IMHO I wouldn't try it on a 2 ohm loads although they are crest clones they skimp on the protection circuitry unlike the original crest amp (IGM, TourClass protection schemes etc.) The clones got only the usual V/I limiter, thermal switch, rail fuses. But they will be happy driving 4 ohm loads day in day out.
I had used a soundstandard CA20 (purple logo) this past holidays driving 3 ohm bass bins per side (that would be 2.66ohms) the amp ran warm but I swear I could see my par lights go a bit dim every time the band hits a strong bass lines. I believe that the 2 ohm loading capability of the amp should only be used on"the show must go on moments" By the way there is a brand new amp in town Kevler MC2 they say it plays louder than the Sound Standard CA20.

thats a good news for me if Crell CA20 is a clone of Crest Audio CA18
i'm planning to buy 2 Crell CA20 but i can get used one Crest Audio CA18 amp(120 Volt version needs step down transformer) for the same price of a one brand new Crell CA20.
does Crell CA20 amp can you drive it in 2 ohm load? according to amp specification you can drive it to 4 ohm load & didn't says about 2 ohm loading.

i need your opinion about this pls.

Hello Bai, you are from Gensan? Im from CDO city.
Please let me share some of my experience to you and other DIY members here, I've been in Guangzhou last July 2008, and had an opportunity to visit some pro audio factories there, well anyway, everybody is welcome there..heheehee

Well there are a lot of China audio companies that manufactures CA series/crest clones amps and other branded clone amps. Some build with less quality at a cheaper price, some build with good quality but has a reasonable price. And some build with high quality but with higher price range too... but... still cheaper than branded WESTERN or UK products imported to our country. Opppps, please note that some have very same casing with branded amps but internal circuits were different... so a little bit tricky unless the covers are open...it's always a flood of amps and speakers there...

The very popular CA clones are from Soundstandard, recently they have upgraded their amps into 3 steps class H but I would suggest not to use 2 ohm load specially heavily compressed bass notes. For midcabs, surely they can and you will have lots of power reserve. If you love to run in 2 ohms, I would recommend a dedicated power lines with a 3 phase wiring, it will solve all your worries but be sure also that your amps is specified it 2 ohm loading.
But sad to say, statistically our country have have 70 to 80 percent poorly wired electrical lines.

Crell CA20 are one of the rebranded CA20. I have Crell also but still in 2 steps class H amplification. Not sure though if they have upgraded their amps recently.

Back in china, there are also exceptional amps there that were build to handle 2 ohms load safely with real time protections as the original branded amps, but as I said earlier, its a little high price range due to higher quality of components used.

You could have it in switch mode power supply or stick with big toroidal transformers.

For toroidal transformers, 3U rack, the highest power range I encountered there is 1800 watts @ 8 ohms and 2700 watts at 4 ohms. Uses one step higher, a B]4 STEPS CLASS H[/B] and uses ON SEMI output transistors. One powerful heavyweight amp at 42KGS

For a switch mode amplifier, 2U rack, handle 2 ohms load very safely at heavy bass signals. Still uses ON SEMI transistors, 2200 watts at 8 ohms, 4400 watts at 8 ohms and 6000 watts at 2 ohms. One very powerful lightweight amp at 15kgs. Can work well from 180 volts to 250 volts.
That time, when we test the switch mode amp, 37.5 degrees ambient temperature, with heavy bass lines for 4 hours straight, 4 speakers per channel, powering each speaker of 1000 watts RMS ( the maximum power the speaker can handle), above that power we smell burnt smoke from speaker I think due to over excursion of drivers, so we lower down the power level to 1000 watts each and the highest temperatures were recorded at 73 degrees at 2 ohm loads. Currently, further enhancement of force air cooling is on going, to suit in hot countries at 2 ohms loads.

It's Iron TYSon and Pacman Pacquiao weight difference....hehehehe.... but on my own personal preference, I prefer the lightweight amps.

@Audiomachines
thanks for the info too!
i think its better to get those used Crest CA18 or the 9001 Amp because of its circuit protection & a little safer to drive those low or sub speakers.
i have a Macrotech 2400 (pics below)but i'm sorry to say this that they are not for sale coz right now i need more amps
i let you know if i can find one for sale or to fix.

My friend is selling his Community speaker RS220 (4pcs.) from Bulacan area.

Just want to know anybody who has some experiences using this kind of speakers. I've heard this speakers in action way back 1994, and it sounds great ! there is a newer version sls920 which has improved hf driver .